In brief:
Often little to none

Most of the time this results in little no leak. As long as there is little to no leak most patients will have no symptoms. Most patients with mitral valve prolapse probably don't even know about it. If there are symptoms usually they are related to an increase in the leakage of the valve.

In brief:
Often little to none

Most of the time this results in little no leak. As long as there is little to no leak most patients will have no symptoms. Most patients with mitral valve prolapse probably don't even know about it. If there are symptoms usually they are related to an increase in the leakage of the valve.
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Chest pain is not usually associated with prolapse. Sometimes mild regurge can be worse with exercise or when BP is increased. Blackouts are associated with many things as well. I would definitely discuss with your doctor.